the perimeter of a recatngle is 54 inches. The width is one inch less than the lenght. FInd the length and width.

I just don't understand how to find the length and width if i am only givent eh perimeter please show work thank you

P = 2L + 2W

54 = 2L + 2(L - 1)

54 = 4L - 2

56 = 4L

14 = L